Alert archive / Louisiana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 71, NWS New Orleans, LA

April 27, 2023Saint Tammany Parish, Washington Parish, Louisiana; Pearl River County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 27, 2023, 2:45 AM CDT for Saint Tammany Parish, Washington Parish, Louisiana; Pearl River County, Mississippi. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 27, 2023, 2:45 AM CDT (07:45 UTC)
Expired
Apr 27, 2023, 3:45 AM CDT
In force
60 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Saint Tammany Parish, LA, Washington Parish, LA, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.8 hours before the alert went out and 50 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2023-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1037 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2023-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1037 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
906 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

Open this sounding in Storm Lab

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 27, 3:19 AM CDTSpecial Weather StatementLIXIberville, Pointe Coupee, West Baton Rouge, West Feliciana56 min
Apr 27, 3:39 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana66 min
Apr 27, 4:19 AM CDTSpecial Weather StatementLIXEast Feliciana41 min
Apr 27, 4:41 AM CDTSpecial Weather StatementLIXAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 1 more64 min
Apr 27, 4:55 AM CDTSevere Thunderstorm WarningLIXEast Feliciana, Saint Helena, West Feliciana27 min
Apr 27, 5:02 AM CDTSevere Thunderstorm Warning Considerable damage threatLIXAscension, Iberville43 min
Apr 27, 5:25 AM CDTSpecial Marine WarningLIX65 min
Apr 27, 6:24 AM CDTSpecial Weather StatementLIXTangipahoa36 min
Apr 27, 6:25 AM CDTSpecial Marine WarningLIX65 min
Apr 27, 6:39 AM CDTSpecial Weather StatementLIXSaint Bernard36 min
Apr 27, 6:54 AM CDTSpecial Marine WarningLIX66 min
Apr 27, 7:10 AM CDTSpecial Marine WarningLIX65 min
Apr 27, 7:25 AM CDTSpecial Weather StatementLIXSaint Tammany50 min
Apr 27, 7:52 AM CDTSpecial Marine WarningLIX53 min
Apr 27, 7:54 AM CDTSevere Thunderstorm WarningLIXAssumption, Lafourche, Saint James, Saint John the Baptist, Terrebonne51 min
Apr 27, 8:13 AM CDTSpecial Marine WarningLIX34 min
Apr 27, 8:14 AM CDTSpecial Weather StatementLIXSaint Tammany61 min
Apr 27, 8:21 AM CDTSpecial Weather StatementLIXSaint Bernard39 min
Apr 27, 8:33 AM CDTSpecial Weather StatementLIXTerrebonne27 min
Apr 27, 8:39 AM CDTAreal Flood AdvisoryLIXSaint Charles, Saint John the Baptist111 min
Apr 27, 8:44 AM CDTSpecial Weather StatementLIXLafourche31 min
Apr 27, 8:54 AM CDTSpecial Marine WarningLIX66 min
Apr 27, 9:03 AM CDTSpecial Marine WarningLIX28 min
Apr 27, 9:05 AM CDTSpecial Weather StatementLIXLafourche25 min
Apr 27, 9:12 AM CDTSpecial Marine WarningLIX48 min
Apr 27, 9:13 AM CDTSpecial Marine WarningLIX46 min
Apr 27, 9:16 AM CDTSpecial Weather StatementLIXLafourche29 min
Apr 27, 9:41 AM CDTSpecial Marine WarningLIX64 min
Apr 27, 9:50 AM CDTSpecial Weather StatementLIXJefferson40 min
Apr 27, 10:03 AM CDTSpecial Marine WarningLIX57 min
Apr 27, 10:06 AM CDTSevere Thunderstorm WarningLIXPlaquemines, Saint Bernard24 min
Apr 27, 10:11 AM CDTSpecial Marine WarningLIX49 min
Apr 27, 10:11 AM CDTSpecial Marine WarningLIX64 min
Apr 27, 10:16 AM CDTSpecial Weather StatementLIXJefferson29 min
Apr 27, 10:27 AM CDTSpecial Marine WarningLIX63 min
Apr 27, 10:36 AM CDTSpecial Weather StatementLIXPlaquemines39 min
Apr 27, 10:48 AM CDTSpecial Marine WarningLIX87 min
Apr 27, 11:15 AM CDTSpecial Marine WarningLIX60 min
Apr 27, 12:15 PM CDTSpecial Marine WarningLIX90 min
Apr 27, 12:17 PM CDTSpecial Marine WarningLIX88 min
Apr 27, 4:00 AM CDTSpecial Weather StatementLIXPearl River60 min
Apr 27, 4:11 AM CDTSevere Thunderstorm WarningLIXPearl River49 min
Apr 27, 4:56 AM CDTSevere Thunderstorm Warning Considerable damage threatLIXPearl River19 min
Apr 27, 6:01 AM CDTSpecial Weather StatementLIXJackson29 min
Apr 27, 6:10 AM CDTSevere Thunderstorm WarningLIXJackson50 min
Apr 27, 6:16 AM CDTSpecial Weather StatementLIXGeorge29 min
Apr 27, 7:29 AM CDTSpecial Weather StatementLIXPearl River31 min
Apr 27, 8:00 AM CDTSpecial Weather StatementLIXPearl River30 min
Apr 27, 8:32 AM CDTSpecial Weather StatementLIXPearl River28 min
Apr 27, 9:06 AM CDTSpecial Weather StatementLIXHancock39 min
Apr 27, 9:25 AM CDTSpecial Weather StatementLIXHarrison80 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2023Severe Thunderstorm Warnings in Mississippi, 2023Every severe thunderstorm warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.